In recent years, the law about guarding against sediment disaster was promulgate, the institution of assigning danger area is pursued step by step, the early warning information system about sediment disaster is established, and a fairly ripe and effective monitoring and early warning technological system is shaped up.
The variables studied were transport of sand, underlying surface roughness, windblown sediment, wind-sand flow structure, soil mechanical composition and amount of wind erosion.
At a height of 0-20 cm, the height increased while the sediment discharge percent of sand flux decreased; there were significant differences in the sand flow formation under different land-use types.
At the same time, better correlative relationship between runoff and sediment production and rainfall and rainfall intensity were testified by multiple regression, but the correlation decreased gradually with the increase of canopy density of forest.
Some principal fabric characteristics of modern till have been presented in this paper by the agency of the analysis of sedimentary fabric of the till in Gangnalou, Shuleinanshan. These include the simple composition group, and the very weak sorting of grain size, the sorting coefficient of grain size being more than 5.14, and the roundness of the stone averageing about 20%. Most of the longest axes of stone are parallel to the direction of ice flow when they are deposited. Their a-axes in the directi...
The Huainan area is situated in the transitional belt of china's,south-north Sinian system,is one of the critical areas to resolve the correlation of the south-north Sinian syst玬 and to build the true sequence;of upper Precarnbrian system of China.This paper is a tentative summary of the authors careful study on a special subject in 1977-1979 assigned by the state. The paper discusses briefly a series,of new discoveries in this recormais-sance survey,for example,in the south of the North China platform,we w...
The formula concerning change of sediment in volume may be used in thestudy of different aspects, such as compacted structures, history of sedimen-tary and structural evolution, reconstruction of paleogeomorphic environme-nts, migration of oil and gas and so on. The range of application of the fo-rmula is discussed on the theoretical basis on which the formula is establish-ed. It is pointed out in this paper that the formula can be used in any stgaeof the sediment compaction, diagenesis or anadi...